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4.5 The pressure tank
IMPORTANT: Air pressure in pressure tank should be set to 70% of the DynaDrive set
pressure. For example, the pressure that DynaDrive comes pre-set to is as follows:
DD60-10(CE) 400kPa (58psi);
DD90-11(CE) 400kPa (58psi);
DD60-10NPT 414kPa (60psi); or
DD90-11NPT 414kPa (60psi).
The default air pressure of the pressure tank used with DynaDrive should be set to:
DD60-10 280kPa (41psi);
DD90-11 280kPa (41psi);
DD60-10CE 280kPa (41psi) tank purchased separately;
DD90-11CE 280kPa (41psi) tank purchased separately;
DD60-10NPT 290kPa (42psi); or
DD90-11NPT 290kPa (42psi)
Never over-charge the tank. Always use air at ambient temperature. Do not overtighten.
During air replenishment the tank should be externally inspected. Any signs of leakage
from the tank may indicate a need for immediate replacement.
If air charge adjustment is required, then follow these procedures:
• Remove the pressure tank completely from pump installation, ensuring to isolate the pressure tank and
release the water pressure from the tank beforehand; or
• Release all water pressure from the pressure tank by switching off the pump at the power point and
opening the closet tap. For above ground supply tanks, it is necessary to close the gate valve between
the supply tank and the pump;
ATTENTION: To prevent personal injury, ensure all water pressure is released from the
pressure system prior to work being performed.
• Leave tap open during air replenishment;
• When all water pressure has been released from the system, check air pressure at air valve on top of
pressure tank. The pre-charge pressure reading should be 70% of set point pressure;
• If necessary, replenish air charge to the correct pressure indicated. Ensure that a tap in outlet piping of
pump is open during replenishment of air pre-charge.
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